[Qemu-devel] [PATCH v2] xen-hvm.c: Always return -1 when failure occurs in xen_hvm_init()

[Chen Gang <gang.chen.5i5j@gmail.com>]

When failure occurs, it need use "return -1" instead of exit(1), so can
let upper caller has chance to print failure information, too.

For simplify thinking, in xen_hvm_init(), also use '-1' instead of all
'-errno', since all related upper callers always exit(1) for failure.

It is not a normal function, it does not release related resources when
return -1, so need give related comments for it.


It passes common check:

  "./configure --enable-xen && make && make check"
  "echo $? == 0"


Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
---
 xen-hvm.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/xen-hvm.c b/xen-hvm.c
index 0d09940..2c6285d 100644
--- a/xen-hvm.c
+++ b/xen-hvm.c
@@ -978,6 +978,7 @@ static void xen_wakeup_notifier(Notifier *notifier, void *data)
     xc_set_hvm_param(xen_xc, xen_domid, HVM_PARAM_ACPI_S_STATE, 0);
 }
 
+/* return 0 means OK, or -1 means critical issue -- will exit(1) */
 int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t *above_4g_mem_size,
                  MemoryRegion **ram_memory)
 {
@@ -991,15 +992,13 @@ int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t *above_4g_mem_size,
     state->xce_handle = xen_xc_evtchn_open(NULL, 0);
     if (state->xce_handle == XC_HANDLER_INITIAL_VALUE) {
         perror("xen: event channel open");
-        g_free(state);
-        return -errno;
+        return -1;
     }
 
     state->xenstore = xs_daemon_open();
     if (state->xenstore == NULL) {
         perror("xen: xenstore open");
-        g_free(state);
-        return -errno;
+        return -1;
     }
 
     state->exit.notify = xen_exit_notifier;
@@ -1069,7 +1068,7 @@ int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t *above_4g_mem_size,
     /* Initialize backend core & drivers */
     if (xen_be_init() != 0) {
         fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__);
-        exit(1);
+        return -1;
     }
     xen_be_register("console", &xen_console_ops);
     xen_be_register("vkbd", &xen_kbdmouse_ops);
-- 
1.9.3